@mixin lh($w) {
    .lh#{$w} {
        line-height: $w*1px;
    }
}

@include lh(20);
@include lh(24);
@include lh(25);
@include lh(35);
@include lh(40);
@include lh(58);
@include lh(55);
@include lh(70);
@include lh(100);
@include lh(140);
@include lh(200);